Hydraulic brake



Oct. 4, 1932. ca. R. BRENT 1,830,194

- nxvmumc BRAKE Filed Sept. 19, 1929 QSheets-Sheet 1 G" E. Bren? Oct. 4, 1932. e. R. BRENT 1,880,194

HYDRAULIC BRAKE Filed Sept. 19, 1929 I5 Sheets-Sheet 2 IIIIIIIIl/AV Patented Get. 4, 1932 UNITED STATES 'FFCE GEORGE E. BRENT, F ORANGE, TEXAS, ASSIGNOR 0F THIRTY-SEVEN AND ONE-HALF ONE-HUNDREDTHS TO EDGAR W. BROWN, 33., ELEVEN ONE-HUNDREDTHS T0 W. E. LEA, TEN ONE-HUNDREDTHS TO CHARLES R. STEELE, AND FOUR ONE-HUNDREDTI-IS T0 C. G. LEE-DY, ALL OF CHICAGO, ILLINOIS i HYDRAULIC mm Application filed September 19', 1929. Serial No. 393,765.

This invention relates to a hydraulic brake mechanism. 7 g

It is aimed to provide a novel, generally improved, simplified, durable and e'tficientconstruction whereby any desired braking effect may be readily assured. 7

It is further aimed to provide a construction wherein braking blades coact with a cam shaped rotor and which rotor is provided with one or more passages to permit the escape of pressure past the blades adjacent the high points of the eccentric or rotor.

Another object is to provide a novel construction wherein the blades cannot all be retracted at the same time out of the path of movement of the rotor or cam to the end that a positive braking effect may always be realized.

Various additional objects and advantages will become apparent from a consideration of the description following taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings Figure 1 is a view in elevation of one form of the braking mechanism,

Figure 2 is a cross sectional view taken on the line 2-2 of Figure 1,

Figure 3 is a vertical sectional view taken on the plane of line 33 of Figure 2,

Figure 1 is a sectional view taken on the line lt of Figure 3,

Figure 5 is a vertical sectional view taken on the same plane as Figure 3 but through a modified form, and

Figure 6 is a detail sectional view taken on the line 66 of Figure 5. v

Referring specifically to the drawings wherein like reference characters designate like or similar parts and first to the form shown in Figures 1 to 4, 10 designates a suitable casing which may comprise a ring 11 and side plates 12 bolted or screwed thereto as at 13. The casing 10 is air and fluid tight and is adapted to contain a quantity of oil or other fluid. Operating within the casing 10 is an eccentric, piston or cam 14: which is keyed or rigid on a shaft 15, extending through stufiing boxes 16 provided in the sldes or plates 12. The shaft is part of or extends Housings 20 are formed by coacti'ng parts of the ring 11 and plates 12 whichslidably mount valves or gates 21, for radial movement and for coaction with the surfaces 18. The valves21 have stems 22 whichare slidably mounted in stuffing boxes 23 provided at the outer ends of the housings and ,coacting with the stems 22 are coil springs 24 which urge valves 21 outwardly to a retracted position beyond the inner wall of the ring 11 so that if desired they will not offer re-i sistance to the travel or rotation of piston 1 1.

The valves 21 are each adapted to be moved inwardly at the same time and by the same mechanism which is diagrammatically show'nas an arcuate member 25 having enlarged slots through which the stems 22 eX- tend and with which the springs 24: engage, Said member 25 has cams 36 to engage the outer end of the springs 2 1 and the member is adaptedto be shifted in an are through rack and piniongearing at 27, the springs 24; always serving to urge the valves 21 away from engagement with piston 14,

The positions of the valves 21 control the passage of fluid from oneside of such valves .to the other, in the chambers formed between each two adjacent portions 17, thereby regulating the braking effect vin any desired manner on the piston 14;, shaft 15, and parts controlled by the latter. 7 7

When the valves 21 reach the position shown by theuppermost one in Figure 3, the grooves 19 will permit the release of pressure from behind such valves 21, that s between the same and the high points 17,

overcoming any tendency of the valves to wedge or stick at the high points.

It will be noted that the valves 21 are pointed'at the edges engaging the walls 18 of the piston. The fluid such as oil may be injected into the casing 10 through a suitable valve device at 25.

' Attention is called to the fact that the arrangement of using three valves 21 and three cam portions 18,-that itis impossible v r at any one time to have all of the valves retracted like the right hand one in Figure 3 p which would render it impossible to 'immediately move one of them to a braking position.

A modified form is shown in Figures 5 and 6 which is similar in all material respects to the preceding form, differing therefrom.

only regarding the piston which is here designated 14' and which functions exactly like that at 14. lhe present piston is substantially oval shape and at its ends has more extended contact at 30 withthe inner surface of the ring. Buttwo cam surfaces at 31 are used corresponding to those at 18, and adjacent the ends thereof, grooves 32 are provided which function similarly to the grooves 19.

Various changes may be resorted to provided they fall within the spirit'and scope of the invention.- a v v I claim as my invention 7 '1. An hydraulic brake device of the class described comprising a casing, a piston operable therein, aplurality of valvesradially movable in the casing to coact with the piston and fluid contained in the casing, said piston having portions adapted to wipe the wall of the casing, and said piston having a pressure-release groove extending in a direction away from the wall and in the portion thereof engageable" by the valves.

, 2. An hydraulic brake device of the class described comprising a casing, a piston op-, 'erabletherein, a plurality of valves radially movable in the casing to coact with the piston and fluid contained in the casing, said piston having portions adapted to wipe the wall of the casing, said piston having a pressure-release groove extending in a direction away from the walland in the portion thereof engageable by the valves, said piston having three sides, and said'valves being three in-number.

Intestimony whereof I aflix my signature.

GEORGE R. BRENT. 1 

